Your search term IL23A returns the following data from GWAS Central:
Phenotype search results:
Search term IL23A was not recognised as a MeSH/HPO phenotype term or synonym

Gene/region search results:
2 Study Datasets reported containing markers in gene or region IL23A (no 5′ and no 3′ flanks) with -log p ≥ 0View and refine results..
1 Marker in gene or region IL23A with -log p ≥ 0View and refine results..
4 Texts contain the keyword IL23AView and refine results..

Studies search results:
4 Studies contain the keyword IL23AView and refine results..

Marker search results:
Search term IL23A was not recognised as a marker identifier or identifiers